Steve -
Sure sounds like bandswitch. Don't forget to check bandswitch hardware for wafer alignment, AND
check wafer center holes for oblong and not round holes!!
You DID disconnect the electrolytic caps from the old twist-lok when you tacked
in the tubulars....?
Verify the RF TUNE pointer is aligned properly.
73, Garey - K4OAH
Glen Allen, VA
Drake 2-B, 2-C/2-NT, 4-A, 4-B, C-Line
and TR-4/C Service Supplement CDs
<www.k4oah.com>
Steve Wedge wrote:
I have not taken out the scope or meter yet. Observations are somewhat random.
My friend Keith's T-4X spent who knows how many years in a New Hampshire cellar. Keith got it at
a hamfest long ago, from parts unknown. It was obvious to me that it had belonged to a smoker and
was pretty grungy anyway, so it got the poolside view in my kitchen, followed by the sauna.
I could "sort of" get output on 20m with it prior to its cleansing. It was obvious by the fact
that it wouldn't work at all on CW that the can capacitor had dried out. I replaced both caps
with modern units under the chassis. I had to sub an 80 uF for the 60 that was there because
that's what I had on hand.
I haven't tried it on all bands yet, but there's some weird stuff going on here:
No output on 40 & 15
60W is about all it can muster on 80 & 20 despite tweaking the trimmers. The rear 80m trimmer
needs to go in more but is against its stop
A couple of watts out on 10.
No sidetone - except on 10m. No real output on 10 (it's like 3 W). There's a somewhat chirpy
sidetone on 10 only.
Neutralization must be way off, as max out on 20 doesn't match the dip.
I'm thinking the switch wafers need some Cramolin applied with a toothpick (yes, I still have a
bottle of the stuff!).
The good news is that all the low-level stuff seems to be working as far as
frequency control.
All the tubes tested good on a TV-10 D/U except the finals which I can't check
on that tester.
Why would I only get any sort of sidetone on 10m?
Take your time, as I'll be setting this aside so that I can get to the two R-4B's I have waiting
that I know I can clean, de-mod and align fairly quickly compared to this sad rig. I was hoping
it was only going to be an alignment and a set of finals away from finishing, but I'll have to
save this for later.
The R-4B's await - Keith told me no rush Smile emoticon
73,
I do suspect
Steve Wedge, W1ES/4
I swear by my life, and my love of it, that I will never live for the sake of another man, nor ask
another man to live for mine.
-Ayn Rand.
All my computers have my signature with various pearls of wisdom appended
thereto.
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